Cardiac ElectrophysiologyCardiologyElectrophysiological ProcessesEpicardial MappingElectrophysiologic Techniques, CardiacModels, CardiovascularArrhythmias, CardiacHeartElectrophysiologyHeart Conduction SystemVoltage-Sensitive Dye ImagingElectrophysiological PhenomenaMyocytes, CardiacElectrocardiographyAction PotentialsAtrioventricular NodeHeart VentriclesComputer SimulationCatheter AblationLong QT SyndromeCardiology Service, HospitalMyocardiumHeart RatePotassium ChannelsCardiac OutputAlgorithmsHeart DiseasesDeath, Sudden, CardiacCardiac Surgical ProceduresCardiac Pacing, ArtificialSocieties, MedicalCardiac Imaging TechniquesCardiac CatheterizationCardiac Care FacilitiesAmerican Heart AssociationHeart FailureTime FactorsPatch-Clamp TechniquesCardiomegalyMyocardial ContractionMyocardial InfarctionHeart AtriaEchocardiographyHeart Defects, CongenitalMembrane Potentials